有四个等边三角形面的四面体。
因此在空间中是一个三角形，空间中是一个四面体，等等。
房子的四面都装有玻璃窗，三角形的或长方形的，为室内提供了充足的光线。
House with Windows on all four sides, triangular or rectangular, to provide ample interior light.
在晶体中观察到多个层错和一个由两个层错三角形组成的层错四面体。
Several stacking faults and a tetrahedron composed of two stacking faults in triangular were observed within the crystal.
研究了体视投影的复原问题，提出了根据两个完全四点形为体视投影恢复三直角四面体的方法。
The problem of reconstruction of a stereo projection is studied. The method of reconstructing a trirectangular tetrahedron from a stereo projection made up of two complete quadrangles is put forward.
相对于三角形网格，四面体网格质量差的单元所占的比例更大、严重变形的单元更多。
Compared with triangular meshes, tetrahedral meshes tend to have a larger proportion of poor quality elements and to have elements that are more severely distorted.
提出一种基于四面体胞的尽可能刚性三角形网格变形算法。
In this paper, we introduce a novel approach to as-rigid-as-possible mesh deformation based on tetrahedral cells.
提出一种基于四面体胞的尽可能刚性三角形网格变形算法。
In this paper, we introduce a novel approach to as-rigid-as-possible mesh deformation based on tetrahedral cells.
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